如图,已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1152b6bfc13e1a4612d96249163e4336.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5697a4e05d9f11a89319c07fbc5798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3ac4f64ddd28704e8234efe921736f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1152b6bfc13e1a4612d96249163e4336.png)
![](https://img.xkw.com/dksih/QBM/2019/9/17/2292521814122496/2292861297106944/STEM/800d52898bf245be898b6209eb4ba535.png?resizew=121)
更新时间:2019-09-18 12:08:50
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【知识点】 三角形的外角的定义及性质解读
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【推荐2】如图,直线l1∥l2,AB⊥l1,垂足为D,BC与直线l2相交于点C,若∠1=30°,则∠2=_______ .
![](https://img.xkw.com/dksih/QBM/2013/6/13/1573662624489472/1573662630592512/STEM/9e511c2af38843a0a941ee396c988591.png?resizew=138)
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